Collapsible chair frame



FIG. 1 is a top perspective view of the collapsible chair frame;

FIG. 2 is a bottom perspective view of the collapsible chair frame;

FIG. 3 is a front elevation view of the collapsible chair frame;

FIG. 4 is a rear elevation view of the collapsible chair frame;

FIG. 5 is a right side elevation view of the collapsible chair frame;

FIG. 6 is a left side elevation view of the collapsible chair frame;

FIG. 7 is a top plan view of the collapsible chair frame; and,

FIG. 8 is a bottom plan view of the collapsible chair frame.

The broken lines shown in the figures are included for the purpose of illustrating environment only and form no part of the claimed design. 

CLAIM The ornamental design for a collapsible chair frame, as shown and described. 